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applied patch contributed by Tim Johansson: adds support for multiple mesh parts in combination with bvh, add short index support for meshes.

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ejcoumans
2007-11-06 06:47:04 +00:00
parent 47afa86482
commit 282cbdcdd9
5 changed files with 39 additions and 14 deletions
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12
src/BulletCollision/CollisionShapes/btOptimizedBvh.h
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@@ -31,6 +31,9 @@ class btStridingMeshInterface;
//Note: currently we have 16 bytes per quantized node
#define MAX_SUBTREE_SIZE_IN_BYTES 2048
// 10 gives the potential for 1024 parts, with at most 2^21 (2097152) (minus one
// actually) triangles each (since the sign bit is reserved
#define MAX_NUM_PARTS_IN_BITS 10
///btQuantizedBvhNode is a compressed aabb node, 16 bytes.
///Node can be used for leafnode or internal node. Leafnodes can point to 32-bit triangle index (non-negative range).
@@ -57,7 +60,14 @@ ATTRIBUTE_ALIGNED16 (struct) btQuantizedBvhNode
int getTriangleIndex() const
{
btAssert(isLeafNode());
return m_escapeIndexOrTriangleIndex;
// Get only the lower bits where the triangle index is stored
return (m_escapeIndexOrTriangleIndex&~((~0)<<(31-MAX_NUM_PARTS_IN_BITS)));
}
int getPartId() const
{
btAssert(isLeafNode());
// Get only the highest bits where the part index is stored
return (m_escapeIndexOrTriangleIndex>>(31-MAX_NUM_PARTS_IN_BITS));
}
}
;